AM:SOURce {BOTH|EXTernal}
Select the source of the modulating signal. The function generator will
accept an internal modulating signal, an external modulating signal,
or both. The default is BOTH. [ Stored in volatile memory ]
The External modulating source is always enabled.
When both sources are enabled (internal-external), the function
generator adds the internal and external modulating signals
(the carrier waveform is actually modulated with two waveforms).
When the internal source is disabled (external only), the carrier
waveform is modulated with the external waveform. The
Ext
annunciator turns on to indicate that the function generator is
expecting a modulating signal on the rear-panel AM Modulation
terminal.
You apply the external modulating waveform to the AM Modulation
terminal. The modulation depth is controlled by the signal level
present (5 volts
peak corresponds to 100% modulation).
AM:SOURce?
Query the modulating source. Returns “
BOTH” or “EXT”.
AM:STATe {OFF|ON}
Disable or enable
AM. To ensure proper operation, you should enable
AM after you have set up the other modulation parameters. Only one
modulation mode can be enabled at a time. When you enable
AM, the
previous modulation mode is turned off.
AM:STATe?
Query the state of
AM. Returns “0” (OFF) or “1” (ON).
Chapter 4 Remote Interface Reference
AM Modulation Commands
156
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